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塔里木盆地顺托果勒低隆起志留系柯坪塔格组下段发育的陆架砂脊为了解古陆架砂脊沉积建造提供了一个理想实例.利用测井和岩心资料,根据沉积物的岩性和沉积构造特征,将陆架砂脊划分为6个岩性相:块状层理中-细砂岩性相(FA1)、丘状交错层理中-细砂岩性相(FA2)、含撕裂状泥砾的中-细砂岩性相(FA3)、双向交错层理含粘土层的细砂岩性相(FA4)、潮汐层理的细砂岩与泥岩互层岩性相(FA5)和水平层理陆架泥岩性相(FA6);依据岩性相的组合特征,将陆架砂脊划分为4个沉积微相:砂脊核微相(FA1-FA2-FA3)、砂脊内缘微相(FA4)、砂脊外缘微相(FA5)和陆架泥微相(FA6);陆架砂脊沉积受陆架潮汐、风暴浪的共同影响.利用钻井约束的三维地震切片属性分析,确定了NE-SW向和NW-SE向两组古陆架砂脊的平面展布特征.古陆架砂脊储层为特低孔、特低渗,其中砂脊核微相储层物性相对较好,平均孔隙度6.96%、平均渗透率0.34×10-3μm2;工业油流主要集中在砂脊核微相储层.古陆架砂脊的砂体多呈脊状或丘状并被厚层的陆架泥披覆,常形成同沉积的微幅背斜-岩性圈闭.
The shelf sand ridge developed in the lower part of the Kepingtage Formation of the Silurogal lowstand system in the Tarim Basin provides an ideal example for the purpose of understanding the formation of the ancient shelf sand ridge sediment.Using logging and core data, Sedimentary tectonic features are divided into six lithology facies: block-like medium-fine sandstone fades (FA1), mound-shaped interlayered medium-fine sandstone facies (FA2) Medium-fine sandstone facies (FA3) of gravel, fine sandstone facies with clayey layers (FA4), tidal layer fine sandstone and mudstone interlayered lithofacies (FA5), and horizontal stratigraphic shelf mudstone (FA6). According to the lithologic facies assemblage characteristics, the continental shelf ridges are divided into four sedimentary microfacies: sand-core nuclei (FA1-FA2-FA3), sand margin microfacies (FA4) And the continental margin microfacies (FA5) and continental shelf mud microfacies (FA6). The continental shelf sands and sediments are affected by both tidal and storm surges.Using the 3D seismic slice attribute analysis of drilling constraints, the NE-SW and NW- SE to the two sets of ancient continental shelf ridge distribution characteristics of the ancient shelf sand ridge reservoir is ultra-low-porosity, extra-low permeability, of which sand-core nuclear reservoir properties are relatively good, flat Porosity of 6.96% and average permeability of 0.34 × 10-3μm2. The industrial oil flow is mainly concentrated in the sand core micromorphic reservoirs, and the sand bodies of the ancient continental shelf sand spines are mostly ridge-shaped or mound-shaped, Cover, often forming the same sedimentary micro anticlinorium - lithologic traps.